The grid in the middle of the screen shows the details of each individual deadlock occurrance.Ĭlicking on a deadlock in the grid will display the deadlock graph at the bottom of the screen. The graph at the top displays the number of deadlocks at a point in time, this makes it easy to identify particularly bad times for deadlocks. This is critical with after the event investigation into why deadlocks occurred with a view to resolving deadlocking to prevent it in the future. ![]() The main server dashboard in miniDBA displays real time deadlocks but the history viewer is where to find any deadlocks that occurred more than a minute ago. As far as I know, the feature is available in all editions, including Express Edition.The deadlocks tab of the history viewer displays the sql server deadlock history over the course of miniDBAs monitoring. And event notifications have been available since SQL Server 2005. The automated generation of Deadlock Graph (*.xdl) files is convenient. I think most would agree it's better to know something (bad) happened before the customers start calling. On the plus side, I really like the proactive nature: an event occurs, I get an email. (The first time I got deadlock alerts, there were more than 500 of them waiting for me in my Inbox.) Lastly, there's the XML issue: it's not everyone's cup of tea. Additionally, you might get hit with an unexpected deluge of emails. There is an authorization issue for _send_dbmail that will need to be addressed for logins without elevated permissions. The approach presented here may have some drawbacks compared to others. The REPLACE function is used to double up any single quotes that may exist.Īs noted, there are other ways to handle deadlocks in SQL Server. This "query" will be the parameter value for _send_dbmail. Next, we create a "query" that does nothing more than select the data as a string literal. This data will become the contents of a file attachment for an email message. The element and all of its data is assigned to the variable. The XML data returned by the EVENTDATA() function that was written to the QUEUE is assigned to the variable: RECEIVE TOP ( 1 ) - just handle one message at a = CAST ( message_body AS XML ) On the queue AND the response wouldn't be sent.ĪLTER QUEUE dbo. At any point before this, weĬould roll back - the received message would be back value ( '(/EVENT_INSTANCE/SessionLoginName)', 'VARCHAR(128)' ) + '' + value ( '(/EVENT_INSTANCE/EventType)', 'VARCHAR(128)' ) SET = 'SET NOCOUNT ON ' + CHAR ( 13 ) + CHAR ( 10 ) + SET = REPLACE (, CHAR ( 39 ), CHAR ( 39 ) + CHAR ( 39 )) query ( '/EVENT_INSTANCE/TextData/deadlock-list' ) AS NVARCHAR ( MAX )) value ( '(/EVENT_INSTANCE/StartTime)', 'VARCHAR(128)' ) ĭECLARE DATETIME = NVARCHAR ( 255 )= 'Deadlock Graph ' + value ( '(/EVENT_INSTANCE/IsSystem)', 'VARCHAR(8)' ) ĭECLARE VARCHAR ( 128 ) =. value ( '(/EVENT_INSTANCE/LoginName)', 'VARCHAR(128)' ) ĭECLARE INT =. ![]() ![]() ), TIMEOUT 1000 - if the queue is empty for one second, give UPDATE and go awayĭECLARE SYSNAME =. RECEIVE TOP ( 1 ) - just handle one message at a = CAST ( message_body AS XML ) Receive the next available message FROM the queue * Purpose : Handles deadlock events (activated by QUEUE queDeadlockNotification) TO SERVICE 'svcDeadlockNotification', 'current database' Create the event notification for Deadlock events on the service. Create a service just for Deadlock events. Create a queue just for Deadlock events.
0 Comments
Leave a Reply. |